When forced to summarize the general theory of relativity in one sentence: Time and space and gravitation have no separate existence from matter.

The unleashed power of the atom has changed everything save our modes of thinking and we thus drift toward unparalleled catastrophe.

If [quantum theory] is correct, it signifies the end of physics as a science.

Anybody who really wants to abolish war must resolutely declare himself in favor of his own country's resigning a portion of sovereignty in place of international institutions.

I believe we are here to do good. It is the responsibility of every human being to aspire to do something worthwhile, to make the world a better place than the one we found.

Failure is only postponed success as long as courage 'coaches' ambition.

All men are ignorant, just in different fields.